Most Kayfun clones are pretty much of a muchness, and most give very satisfactory service. I've only had one that I was not satisfied with, and that was a pmma version. The deck is fine ,but the tank chimney and top cap, just don't seal effectively. Apart from my negative experience with that particular clone version, the KF clones known as "Rocket" do not get favourable reviews so that's something to bare in mind.
A point to remember, and often forgotten and ignored, is that vendors don't make the clone, they only sell them, and many have been manufactured at the same workshop, so to say that a clone from X is better than a clone from Y is a bit of a wild card and only based upon the customers experience with that particular item. That's not such a negative thing to say, and if a customer is happy with a particular clone, from a particular vendor, then it's all good.
My simple 'rule of thumb' with regards to the various fetch clones, is just to buy the most expensive one. The difference is only pennies, and the extra pennies must be there for a reason.